Answer:
Gravity? is it multiple choice?
When you first learn some information, the first place it goes in your brain is to your short-term memory. So, you read something, or hear something, and it stays in your short-term memory for a little while. If you don't hear it again, or that information doesn't get repeated, it is likely to disappear from your memory - you will forget it. However, the more you repeat that information, the more likely it is that it will be remembered, that is, it will enter your long-term memory and stay there for a long time.
Hope this helps :)
I expect the acceleration to be 1 m/s² .
I didn't take time to puzzle over my response too much. You said that the net force on the wagon is 1 Newton, and I remember that I learned (in 1958 I think) that 1 Newton is the force that accelerates 1 kg of mass at 1 m/s². So there ya go.
Sometimes if you're a fast worker then more job can be done. if you're slow it will take a lot more time. So I guess depends on situation.